<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link rel="stylesheet" href="./css/demo.css" />
  </head>

  <body></body>

  <script>
    // 这是单行注释
    /* 这是多行注释 */
    alert("弹框...");
  </script>
</html>
